Brother MFC-J3540DW Online User's Manual page 17

If you turn the machine off using
prolong print head life, provide better ink efficiency, and maintain print quality, keep your machine connected
to a power source at all times.
MFC-J3940DW
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1. NFC (Near Field Communication) symbol
You can use card authentication by touching the IC card to the NFC symbol on the control panel.
™
If your Android device supports the NFC feature, you can print from your device by touching it to the NFC
symbol.
2. Touchscreen Liquid Crystal Display (LCD)
Access menus and options by pressing them on the touchscreen.
3. Menu Buttons
(Back)
Press to go back to the previous menu.
(Home)
Press to return to the Home screen.
(Cancel)
Press to cancel an operation.
4. Dial Pad
Press the numbers to dial telephone or fax numbers and to enter the number of copies.
5. LED Power Indicator
The LED lights up depending on the machine's power status.
When the machine is in Sleep Mode, the LED blinks.
, it will still clean the print head periodically to maintain print quality. To
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